US4479043A - Controlling the zone of longitudinally seam-welding split tubes - Google Patents
Controlling the zone of longitudinally seam-welding split tubes Download PDFInfo
- Publication number
- US4479043A US4479043A US06/369,819 US36981982A US4479043A US 4479043 A US4479043 A US 4479043A US 36981982 A US36981982 A US 36981982A US 4479043 A US4479043 A US 4479043A
- Authority
- US
- United States
- Prior art keywords
- edges
- welding
- zone
- skelp
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/02—Seam welding
- B23K13/025—Seam welding for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/02—Seam welding
Definitions
- the present invention relates to controlling or varing the welding during high frequency, longitudinal seam welding of tubes and pipes.
- the art of the tube and pipe making includes, as a particular process step, the longitudinal seam welding of adjoining or abutting edges of a suitably bent skelp.
- a preparatory step it is known to trim the edges and to shape them in a cutting stage so that the edge corners have right angles to the adjoining flat surface portion of the skelp; accordingly, the abutting and adjoining edges of the folded skelp to be welded together, meet at least most plain parallelly to each other. Consequently, a heat transfer barrier is locally set up, and due to the physics underlying the flow and distribution of the electric welding current in the skelp edge zone an excessive amount of heating occurs in the inner and outer corner portions of the edges. They will therefore, fuse slightly earlier than more central edge zone and unfortunately impede a complete removal of the oxide from these more central edge zone portions.
- the skelp edges immediately before the welding and also prior to heating the edges for purposes of welding so that a more uniform temperature distribution is obtained across the entire surface, which is composed of the two edge-surfaces as abutting during the welding and the welding of the edge zone begins in the middle and progresses in an outward direction as to the edge surface.
- This particular method will improve greatly the quality of the weld and is particularly applicable in the art of tube making using skelp and strip material that is quite thick and is preferably made of a high strength steel.
- FIG. 1 illustrates somewhat schematically and in perspective view equipment for practicing the preferred embodiment of the present invention in accordance with the best mode thereof;
- FIG. 2 illustrates a cross section of the device and particularly of the skelp shown in FIG. 1;
- FIG. 3 is a group of three figures identified by a, b, and c for a schematic illustration and demonstration of the prior art practice and its problems;
- FIG. 4 is analogous a group of three figures identified by a, b, and c and illustrating how the inventive method affects and modified the previous, undesirable conditions.
- Reference No. 10 refers here to the piece of skelp having straight edges 10a and 10b originally being the small sides of the skelp that face away from each other. Pursuant to bending these faces are now approaching each other for purposes of being welded together.
- the high frequency method of heating the edges results in melting zones 11a and 11b which show a deeper penetration of the heating current near the corner portions so that a larger portion is being heated and at a greater depth than in more central portions of the skelp.
- the dashed lines are isotherms demonstrating that the corners such as 12aa, 12ab, 12ba and 12bb are hotter than central zones 13a and 13b of the skelp edges.
- the zone 11a in FIG. 3b shows that the particular melting zones cause that melting to advance further near the corners than in middle areas 13a, assuming that welding progressed from the right to the left and the melted portion 11a is advanced toward the left in the figure. This is the reason for an incomplete removal of oxide from that central portion, the oxide does not have any way to go and is trapped in between the adjoining skelp edge which fuse earlier in the forwardly extending, melted corner zones.
- FIG. 3c is an oscillographic picture of the distribution of the electric current across the edges and taken along Line c--c in FIG. 3b.
- the graph shows that the corner zones of the skelp edges receive preferred quantities of electric current; a reduction is observed in the more central portion thereof.
- FIG. 1 there is illustrated equipment in perspective view as well as in cross section of a skelp or strip 10 being folded or bent longitudinally into a split tube so that its adjoining edges can be longitudinally seam welded.
- Reference No. 1 refers to two roll holders and roll journalling devices respectively supporting two concavely contoured rolls 2. These rolls are passive in nature i.e. they do not have to be driven.
- the set of arrows indicates that the respective frame and holder 1, can be position-adjusted for obtaining the proper operating position in respect to the other one and to the bent skelp passing through.
- the two rolls and their respective holders are arranged up-stream from the welding zone, the skelp 10 progressing in the direction of the arrow 10' through the welding station 7 referring particularly to an electrode by means of which high frequency energy is applied to the tube to be made, and that energy will be effective primarily in the edge zones.
- the two rolls 2 are disposed specifically up-stream from this high frequency welding zone. In other words, the two rolls engage or are positioned to engage the not yet adjoining edges of skelp 10 up-stream from the heating and fusion. These two rolls impart upon the edges a convex contour as shown in FIG. 4a.
- a temperature sensor 3 is disposed down-stream from the rolls 2 and from the point of heating but up-stream from welding and fusion.
- the device 3 measures the temperature of both edges of the skelp i.e. it measures all those edge portions which will become the welding zone. Specifically, instrument 3 ascertains whether or not the two edges are equally hot. Also, one may detect separately whether there is a temperature difference across one or each of the edges.
- the temperature measuring device 3 is electrically connected to an electric circuit 4 which in turn operates an adjusting device 5 illustrated merely schematically and by a double arrow to indicate the resulting control action transmitted from the circuit 4 upon the device 5 by means of a connection 6.
- an edge cutting and trimming station is still disposed more up-stream from the arrangement as shown, which is to the left front of the drawing of FIG. 1.
- the rolls 2 modify the straight edges as provided by and in this cutter station in order to obtain a convex contour as shown in FIG. 4a.
- FIG. 4c illustrates an oscillographic display of the electric current distribution across an edge and one can see that through appropriately selecting the convexity of the edge a very even electric current distribution is obtainable.
- the purpose of measuring the temperature of the about to be welded edges is to cause one of the rolls to be adjusted, or both of them, by tilting or otherwise shifting the angle of orientation of the respective roll vis-a-vis the edge it works so that the convexity (curvature) is changed to obtain, indeed, a uniform temperature distribution of the welding zone.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3116364A DE3116364C1 (en) | 1981-04-21 | 1981-04-21 | Method and device for changing the welding area during HF longitudinal seam welding of pipes |
DE3116364 | 1981-04-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4479043A true US4479043A (en) | 1984-10-23 |
Family
ID=6130773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/369,819 Expired - Fee Related US4479043A (en) | 1981-04-21 | 1982-04-19 | Controlling the zone of longitudinally seam-welding split tubes |
Country Status (3)
Country | Link |
---|---|
US (1) | US4479043A (en) |
JP (1) | JPS57175088A (en) |
DE (1) | DE3116364C1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070034607A1 (en) * | 2005-08-12 | 2007-02-15 | Thermatool Corp. | System and method of computing the operating parameters of a forge welding machine |
US20070095878A1 (en) * | 2005-11-03 | 2007-05-03 | Paul Scott | Method and system for monitoring and controlling characteristics of the heat affected zone in a weld of metals |
US20100258535A1 (en) * | 2007-11-05 | 2010-10-14 | Kazuhiko Fukutani | Steel pipe material weld zone heating apparatus and method |
US20120187096A1 (en) * | 2009-04-08 | 2012-07-26 | V & M Deutschland Gmbh | Method and device for connecting the ends of steel tubes by means of orbital welding using a hybrid technique |
US20170179841A1 (en) * | 2015-12-22 | 2017-06-22 | Thermatool Corp. | High Frequency Power Supply System with Closely Regulated Output for Heating a Workpiece |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1857505A (en) * | 1928-03-21 | 1932-05-10 | Smith Corp A O | Method of butt welding by means of alpha flashing electric arc |
US2021157A (en) * | 1933-06-23 | 1935-11-19 | Columbus Mckinnon Chain Corp | Method of welding |
US3504149A (en) * | 1967-11-29 | 1970-03-31 | Westinghouse Electric Corp | Brazing method |
SU512017A1 (en) * | 1973-06-15 | 1976-04-30 | Предприятие П/Я А-3602 | Method for high-frequency welding of thick-walled products |
US4181845A (en) * | 1977-07-11 | 1980-01-01 | Smith International, Inc. | Apparatus for tempering the weld between a tool joint connector and a drill pipe tube |
-
1981
- 1981-04-21 DE DE3116364A patent/DE3116364C1/en not_active Expired
-
1982
- 1982-03-17 JP JP57042493A patent/JPS57175088A/en active Pending
- 1982-04-19 US US06/369,819 patent/US4479043A/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1857505A (en) * | 1928-03-21 | 1932-05-10 | Smith Corp A O | Method of butt welding by means of alpha flashing electric arc |
US2021157A (en) * | 1933-06-23 | 1935-11-19 | Columbus Mckinnon Chain Corp | Method of welding |
US3504149A (en) * | 1967-11-29 | 1970-03-31 | Westinghouse Electric Corp | Brazing method |
SU512017A1 (en) * | 1973-06-15 | 1976-04-30 | Предприятие П/Я А-3602 | Method for high-frequency welding of thick-walled products |
US4181845A (en) * | 1977-07-11 | 1980-01-01 | Smith International, Inc. | Apparatus for tempering the weld between a tool joint connector and a drill pipe tube |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070034607A1 (en) * | 2005-08-12 | 2007-02-15 | Thermatool Corp. | System and method of computing the operating parameters of a forge welding machine |
US7683288B2 (en) | 2005-08-12 | 2010-03-23 | Thermatool Corp. | System and method of computing the operating parameters of a forge welding machine |
US20070095878A1 (en) * | 2005-11-03 | 2007-05-03 | Paul Scott | Method and system for monitoring and controlling characteristics of the heat affected zone in a weld of metals |
US20100258535A1 (en) * | 2007-11-05 | 2010-10-14 | Kazuhiko Fukutani | Steel pipe material weld zone heating apparatus and method |
US8383978B2 (en) * | 2007-11-05 | 2013-02-26 | Nippon Steel Corporation | Steel pipe material weld zone heating apparatus and method |
US20120187096A1 (en) * | 2009-04-08 | 2012-07-26 | V & M Deutschland Gmbh | Method and device for connecting the ends of steel tubes by means of orbital welding using a hybrid technique |
US10124433B2 (en) * | 2009-04-08 | 2018-11-13 | Vallourec Deutschland Gmbh | Method and device for connecting the ends of steel tubes by means of orbital welding using a hybrid technique |
US20170179841A1 (en) * | 2015-12-22 | 2017-06-22 | Thermatool Corp. | High Frequency Power Supply System with Closely Regulated Output for Heating a Workpiece |
US10855194B2 (en) * | 2015-12-22 | 2020-12-01 | Thermatool Corp. | High frequency power supply system with closely regulated output for heating a workpiece |
Also Published As
Publication number | Publication date |
---|---|
JPS57175088A (en) | 1982-10-27 |
DE3116364C1 (en) | 1982-10-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MANNESMANN AKTIENGESELLSCHAFT; MANNESMANNUFER 2, 4 Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:HESS, WALTER;NICOLAI, FRANZ;TREISS, ERICH;AND OTHERS;REEL/FRAME:004018/0747 Effective date: 19820402 Owner name: MANNESMANN AKTIENGESELLSCHAFT, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HESS, WALTER;NICOLAI, FRANZ;TREISS, ERICH;AND OTHERS;REEL/FRAME:004018/0747 Effective date: 19820402 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19961023 |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |